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Title: The redox chemistry of neptunium in γ-irradiated aqueous nitric acid in the presence of an organic phase

The radiolytic changes in oxidation state for solutions of initially Np(V) and/or Np(VI) were investigated by gamma-irradiation in conjunction with UV/Vis spectroscopy of the aqueous phase. Samples were irradiated in varying concentrations of nitric acid, and with or without the presence of 30% TBP in dodecane. At short irradiation times Np(V) was oxidized to Np(VI), even in the presence of the organic phase. Upon the radiolytic production of sufficient amounts of nitrous acid, reduction of Np(VI) to Np(V) occurred in both phases. This was accompanied by stripping of the previously extracted Np(VI). Nitric acid concentrations of 6 M mitigated this reduction.
Authors:
 [1] ;  [2] ;  [3]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  2. Oregon State Univ., Corvallis, OR (United States); Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic)
  3. Oregon State Univ., Corvallis, OR (United States)
Publication Date:
Report Number(s):
INL/JOU-15-36192
Journal ID: ISSN 0236-5731; PII: 4530
Grant/Contract Number:
AC07-05ID14517
Type:
Accepted Manuscript
Journal Name:
Journal of Radioanalytical and Nuclear Chemistry
Additional Journal Information:
Journal Volume: 308; Journal Issue: 3; Journal ID: ISSN 0236-5731
Publisher:
Springer
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; neptunium; radiation chemistry; redox chemistry; solvent extraction
OSTI Identifier:
1358433

Mincher, Bruce J., Precek, Martin, and Paulenova, Alena. The redox chemistry of neptunium in γ-irradiated aqueous nitric acid in the presence of an organic phase. United States: N. p., Web. doi:10.1007/s10967-015-4530-6.
Mincher, Bruce J., Precek, Martin, & Paulenova, Alena. The redox chemistry of neptunium in γ-irradiated aqueous nitric acid in the presence of an organic phase. United States. doi:10.1007/s10967-015-4530-6.
Mincher, Bruce J., Precek, Martin, and Paulenova, Alena. 2015. "The redox chemistry of neptunium in γ-irradiated aqueous nitric acid in the presence of an organic phase". United States. doi:10.1007/s10967-015-4530-6. https://www.osti.gov/servlets/purl/1358433.
@article{osti_1358433,
title = {The redox chemistry of neptunium in γ-irradiated aqueous nitric acid in the presence of an organic phase},
author = {Mincher, Bruce J. and Precek, Martin and Paulenova, Alena},
abstractNote = {The radiolytic changes in oxidation state for solutions of initially Np(V) and/or Np(VI) were investigated by gamma-irradiation in conjunction with UV/Vis spectroscopy of the aqueous phase. Samples were irradiated in varying concentrations of nitric acid, and with or without the presence of 30% TBP in dodecane. At short irradiation times Np(V) was oxidized to Np(VI), even in the presence of the organic phase. Upon the radiolytic production of sufficient amounts of nitrous acid, reduction of Np(VI) to Np(V) occurred in both phases. This was accompanied by stripping of the previously extracted Np(VI). Nitric acid concentrations of 6 M mitigated this reduction.},
doi = {10.1007/s10967-015-4530-6},
journal = {Journal of Radioanalytical and Nuclear Chemistry},
number = 3,
volume = 308,
place = {United States},
year = {2015},
month = {10}
}